What does the Johnson Starley FL fault code mean?

Your boiler has detected that the water pressure is too low for it to operate safely, which is why it has stopped working.

How much does it cost to fix Johnson Starley error code FL?

Typical repair cost for the Johnson Starley FL fault is £0-120 including labour.

Locate the external filling loop, which is usually a flexible silver hose with two small valves.

Low pressure warning. Activates between 0.3bar & 0.8bar. The number which shows after FL is the pressure in bar (e.g. FL 03 = 0.3 bar of pressure).

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Six most common causes of dropping pressure.

Step-by-step using the filling loop.

7 signs repair isn't worth it anymore.